This doesn't really explain why Office and any other installed software has disappeared.
Refreshing Win 8 should preserve installed software, photos etc.
Recycle or Restart from the same screen does a factory reset. You would lose installed software, photos etc.
Is this the case ?
If you have had a virus - as you suspect - then you really need one of our experts to take a look at your system.
Post the logs .....better to be sure :)
I doubt that you would get anywhere with PC World.
Download Magic Jellybean from here - click here - use the FREE option.
When installing select the "Custom Install" and uncheck the option to install the other software.
Run it.
It should find the Office Product Code - if it is on the system.
If, as I suspect, the system has been restored then it will not find it.
There is a free option to Office - Open Office - click here - this is totally free and compatible with MS Office.
You can have both on your system at the same time.
If you can locate the Product Code then it will be possible to use somebody else's disk to reinstall - using your own Product Code.
EDIT:
Just found another option - click here
There is an option to re-install Office here ......but you will need the Product Code
Also found this which may prove useful - click here